Spark plug

Details Spark plug Spark plug

2007-03-14

2008-10-07

Santiago, Mariceli (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S143000

Reexamination Certificate

active

07432641

ABSTRACT:
A plurality of insulator samples of different dimensions are subjected to multiple regression analysis to thereby induce an expression for estimating the amount of unevenness in wall thickness of an insulator; specifically, 0.01 (17.527+0.141A−0.285B−6.124C−0.14D+1.105E), where A is an overall length of the insulator, B is the outside diameter of a rear trunk portion of the insulator, C is the diameter of a large diameter portion of the axial bore of the insulator, D is the length of the large diameter portion of the bore, and E is the diameter of a small diameter portion of the axial bore. The insulator is designed such that the amount of unevenness in wall thickness thereof estimated through calculation by this expression is less than 0.07 mm.

REFERENCES:
patent: 6310430 (2001-10-01), Moriya
patent: 2002/0067111 (2002-06-01), Shibata et al.
patent: 2006/0202599 (2006-09-01), Kato
patent: 2001176637 (2001-06-01), None

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